Heated drum apparatus for desiccating liquids and semiliquids



June 22, 1937. w. SASSE ET AL 2,084,537

HEATED DRUM APPARATUS FOR DESICCATING LIQUIDS AND SEMILIQUIDS Original Filed Dec. 27, 1954 ware/.2; 51K

ERNST I -HELN Patented June 22, 1937 UNITED STATES HEATED DRUM APPARATUS FOR DESICCAT- ING LIQUIDS AND SEMILIQUIDS Wilhelm Sasse, Weimar, and Ernst Schneider, Uerdingen-on-the-Rhine, Germany, assignors to The Buell Combustion Company Limited, London, England, a British limited-liability company Original application December 2'], 1934, Serial No. 759,376. Divided and this application March 19, 1936, Serial No. 69,612.

nary 8, 1934 1 Claim.

This invention relates to heated drum apparatus for desiccating liquids or semi-liquids of that type in which the liquid material is withdrawn from a receptacle and transported to the 5 heated drum by means of feed rollers coacti'ng with one another and with the heated drum such as is described in the specification of the United .States Patent No. 1,827,617. This application is a division of our co-pending application Serial No. 759,376 filed 27th December 1934, which'has now matured into United States Patent No.

2,046,489. This invention has for its object the provision of means whereby the range of thickness of the desiccated layer'can be materially extended beyond that of knownmachines of the same type and in such a manner as to enable the output of dried solids by the machine per unit area of heating surface to be largely increased.

In known machines it is found that in the application of fluid material by means of rollers pressing on the drying drum, dimculty arises from inadequate application, i. e. the quantity of the material which it is actually possible to dry is so small that the working of the machine in an 25,economical manner in terms of cost of machine cannot be attained. It has now been discovered that if pressure of the'material on the drying roller is practically dispensed with, and the feed roller is provided with a grooved periphery 90 and is allowed to revolve in proximity to the periphery of the drying drum, 'so that contact without pressure'o'n the drying surface results, the quantity of fluid applied and actually dried can be considerably greater, The continuous 35 running of! of the liquid in the course of the application which ordinarily takes place in known machines no longer occurs owing to the fact'that j the fluid material applied to the drying drum, not being under pressure, rapid evaporation sets 4 in, and the'material immediately assumes such a consistency as to render it impossible for any.

subsequent free running of! of the material from the ascending surface of the drying drum to takeplace. 45 The subject of the. invention is shown by way of example in the drawing, which shows the invention in the case of a single-roller dryer. The drying drum areceives'the application of the fluid material by means of a feed roller b provided with grooves l disposed in an axial direction and adapted to revolve in the opposite direction to that of the drying roller apThe roller 0 which is located underneath the'roller b and revolves in the same direction picks up liquid In Germany Janfrom the dipping container e and delivers it to the grooved periphery of the roller b. The simultaneous lifting device for these two feed rollers arranged in series one behind the other consists of the usual frame d, pivot j and weight g, whilst the dried material is finally scraped from the drying surface by means of the known blade device h prior to the application of new material as the drum 0 revolves. The distance between the axis of the drying drum a and feed roller 1) is definitely predetermined by means of an adjustable device such as a screw'k against which the weight g reacts.

l When the machine is in operation the liquid in the container e is lifted by the roller 0 and delivered into the grooves l of the feed roller b and is carried upward past the line along which the edge between any two grooves l is closest to the periphery of the drying drum a which carries the liquid up and evaporates it. It will be seen that the material under treatment is not pressed down on the feedroller b or drying drum a so as to consolidate it in any way in its passage from the container e to the periphery of the drying drum above the feed roller b.

It is obvious that the feed rollers 17 and a can be driven in the opposite direction to that shown in the drawing and the feed roller 0 can be disposed on the opposite side of the roller b so as to deliver the liquid on to the upper part of the feed roller 1) for transmission to the drying drum a as described and illustrated in the specification of our application for Letters Patent under Serial No. 759,376. I

We claim: 1

In a drying machine of the type described, a rotary drying drum in combination with a rotary feed roller adapted to revolve in close proximity to the drying drum without pressure, a series of grooves disposed evenly over the periphery of said feed roller in a substantially axial direction and having the cylindrical surface between the grooves of a practically minimum width adapted to carry up the liquid material into contact with the periphery oi the said drying drum, a container for the liquid material, a dipping ieed roller running in the'same direction as the grooved feed roller, means for driving the said drum and the said feed rollers in close proximity to one another, adjustable means for varying the distance between the axes of the drying drum and feed roller in a predetermined manner.

WILHELM SASSE. ERNST SCHNEIDER. 

